51956321257 has 2 divisors, whose sum is σ = 51956321258. Its totient is φ = 51956321256.

The previous prime is 51956321251. The next prime is 51956321267. The reversal of 51956321257 is 75212365915.

51956321257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39360972816 + 12595348441 = 198396^2 + 112229^2 .

It is a cyclic number.

It is not a de Polignac number, because 51956321257 - 2¹¹ = 51956319209 is a prime.

It is not a weakly prime, because it can be changed into another prime (51956321251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25978160628 + 25978160629.

It is an arithmetic number, because the mean of its divisors is an integer number (25978160629).

Almost surely, 2^51956321257 is an apocalyptic number.

It is an amenable number.

51956321257 is a deficient number, since it is larger than the sum of its proper divisors (1).

51956321257 is an equidigital number, since it uses as much as digits as its factorization.

51956321257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 567000, while the sum is 46.

The spelling of 51956321257 in words is "fifty-one billion, nine hundred fifty-six million, three hundred twenty-one thousand, two hundred fifty-seven".